/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
/**
 * Class: mxSvgCanvas2D
 *
 * Extends <mxAbstractCanvas2D> to implement a canvas for SVG. This canvas writes all
 * calls as SVG output to the given SVG root node.
 * 
 * (code)
 * var svgDoc = mxUtils.createXmlDocument();
 * var root = (svgDoc.createElementNS != null) ?
 * 		svgDoc.createElementNS(mxConstants.NS_SVG, 'svg') : svgDoc.createElement('svg');
 * 
 * if (svgDoc.createElementNS == null)
 * {
 *   root.setAttribute('xmlns', mxConstants.NS_SVG);
 *   root.setAttribute('xmlns:xlink', mxConstants.NS_XLINK);
 * }
 * else
 * {
 *   root.setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:xlink', mxConstants.NS_XLINK);
 * }
 * 
 * var bounds = graph.getGraphBounds();
 * root.setAttribute('width', (bounds.x + bounds.width + 4) + 'px');
 * root.setAttribute('height', (bounds.y + bounds.height + 4) + 'px');
 * root.setAttribute('version', '1.1');
 * 
 * svgDoc.appendChild(root);
 * 
 * var svgCanvas = new mxSvgCanvas2D(root);
 * (end)
 * 
 * A description of the public API is available in <mxXmlCanvas2D>.
 * 
 * To disable anti-aliasing in the output, use the following code.
 * 
 * (code)
 * graph.view.canvas.ownerSVGElement.setAttribute('shape-rendering', 'crispEdges');
 * (end)
 * 
 * Or set the respective attribute in the SVG element directly.
 * 
 * Constructor: mxSvgCanvas2D
 *
 * Constructs a new SVG canvas.
 * 
 * Parameters:
 * 
 * root - SVG container for the output.
 * styleEnabled - Optional boolean that specifies if a style section should be
 * added. The style section sets the default font-size, font-family and
 * stroke-miterlimit globally. Default is false.
 */
function mxSvgCanvas2D(root, styleEnabled) {
  mxAbstractCanvas2D.call(this);

  /**
	 * Variable: root
	 * 
	 * Reference to the container for the SVG content.
	 */
  this.root = root;

  /**
	 * Variable: gradients
	 * 
	 * Local cache of gradients for quick lookups.
	 */
  this.gradients = [];

  /**
	 * Variable: defs
	 * 
	 * Reference to the defs section of the SVG document. Only for export.
	 */
  this.defs = null;
	
  /**
	 * Variable: styleEnabled
	 * 
	 * Stores the value of styleEnabled passed to the constructor.
	 */
  this.styleEnabled = (styleEnabled != null) ? styleEnabled : false;
	
  let svg = null;
	
  // Adds optional defs section for export
  if (root.ownerDocument != document) {
    let node = root;

    // Finds owner SVG element in XML DOM
    while (node != null && node.nodeName != 'svg') {
      node = node.parentNode;
    }
		
    svg = node;
  }

  if (svg != null) {
    // Tries to get existing defs section
    const tmp = svg.getElementsByTagName('defs');
		
    if (tmp.length > 0) {
      this.defs = svg.getElementsByTagName('defs')[0];
    }
		
    // Adds defs section if none exists
    if (this.defs == null) {
      this.defs = this.createElement('defs');
			
      if (svg.firstChild != null) {
        svg.insertBefore(this.defs, svg.firstChild);
      } else {
        svg.appendChild(this.defs);
      }
    }

    // Adds stylesheet
    if (this.styleEnabled) {
      this.defs.appendChild(this.createStyle());
    }
  }
}

/**
 * Extends mxAbstractCanvas2D
 */
mxUtils.extend(mxSvgCanvas2D, mxAbstractCanvas2D);

/**
 * Capability check for DOM parser.
 */
(function () {
  mxSvgCanvas2D.prototype.useDomParser = !mxClient.IS_IE && typeof DOMParser === 'function' && typeof XMLSerializer === 'function';
	
  if (mxSvgCanvas2D.prototype.useDomParser) {
    // Checks using a generic test text if the parsing actually works. This is a workaround
    // for older browsers where the capability check returns true but the parsing fails.
    try {
      const doc = new DOMParser().parseFromString('test text', 'text/html');
      mxSvgCanvas2D.prototype.useDomParser = doc != null;
    } catch (e) {
      mxSvgCanvas2D.prototype.useDomParser = false;
    }
  }
}());

/**
 * Variable: path
 * 
 * Holds the current DOM node.
 */
mxSvgCanvas2D.prototype.node = null;

/**
 * Variable: matchHtmlAlignment
 * 
 * Specifies if plain text output should match the vertical HTML alignment.
 * Defaul is true.
 */
mxSvgCanvas2D.prototype.matchHtmlAlignment = true;

/**
 * Variable: textEnabled
 * 
 * Specifies if text output should be enabled. Default is true.
 */
mxSvgCanvas2D.prototype.textEnabled = true;

/**
 * Variable: foEnabled
 * 
 * Specifies if use of foreignObject for HTML markup is allowed. Default is true.
 */
mxSvgCanvas2D.prototype.foEnabled = true;

/**
 * Variable: foAltText
 * 
 * Specifies the fallback text for unsupported foreignObjects in exported
 * documents. Default is '[Object]'. If this is set to null then no fallback
 * text is added to the exported document.
 */
mxSvgCanvas2D.prototype.foAltText = '[Object]';

/**
 * Variable: foOffset
 * 
 * Offset to be used for foreignObjects.
 */
mxSvgCanvas2D.prototype.foOffset = 0;

/**
 * Variable: textOffset
 * 
 * Offset to be used for text elements.
 */
mxSvgCanvas2D.prototype.textOffset = 0;

/**
 * Variable: imageOffset
 * 
 * Offset to be used for image elements.
 */
mxSvgCanvas2D.prototype.imageOffset = 0;

/**
 * Variable: strokeTolerance
 * 
 * Adds transparent paths for strokes.
 */
mxSvgCanvas2D.prototype.strokeTolerance = 0;

/**
 * Variable: minStrokeWidth
 * 
 * Minimum stroke width for output.
 */
mxSvgCanvas2D.prototype.minStrokeWidth = 1;

/**
 * Variable: refCount
 * 
 * Local counter for references in SVG export.
 */
mxSvgCanvas2D.prototype.refCount = 0;

/**
 * Variable: blockImagePointerEvents
 * 
 * Specifies if a transparent rectangle should be added on top of images to absorb
 * all pointer events. Default is false. This is only needed in Firefox to disable
 * control-clicks on images.
 */
mxSvgCanvas2D.prototype.blockImagePointerEvents = false;

/**
 * Variable: lineHeightCorrection
 * 
 * Correction factor for <mxConstants.LINE_HEIGHT> in HTML output. Default is 1.
 */
mxSvgCanvas2D.prototype.lineHeightCorrection = 1;

/**
 * Variable: pointerEventsValue
 * 
 * Default value for active pointer events. Default is all.
 */
mxSvgCanvas2D.prototype.pointerEventsValue = 'all';

/**
 * Variable: fontMetricsPadding
 * 
 * Padding to be added for text that is not wrapped to account for differences
 * in font metrics on different platforms in pixels. Default is 10.
 */
mxSvgCanvas2D.prototype.fontMetricsPadding = 10;

/**
 * Variable: cacheOffsetSize
 * 
 * Specifies if offsetWidth and offsetHeight should be cached. Default is true.
 * This is used to speed up repaint of text in <updateText>.
 */
mxSvgCanvas2D.prototype.cacheOffsetSize = true;

/**
 * Function: format
 * 
 * Rounds all numbers to 2 decimal points.
 */
mxSvgCanvas2D.prototype.format = function (value) {
  return parseFloat(parseFloat(value).toFixed(2));
};

/**
 * Function: getBaseUrl
 * 
 * Returns the URL of the page without the hash part. This needs to use href to
 * include any search part with no params (ie question mark alone). This is a
 * workaround for the fact that window.location.search is empty if there is
 * no search string behind the question mark.
 */
mxSvgCanvas2D.prototype.getBaseUrl = function () {
  let href = window.location.href;
  const hash = href.lastIndexOf('#');
	
  if (hash > 0) {
    href = href.substring(0, hash);
  }
	
  return href;
};

/**
 * Function: reset
 * 
 * Returns any offsets for rendering pixels.
 */
mxSvgCanvas2D.prototype.reset = function () {
  mxAbstractCanvas2D.prototype.reset.apply(this, arguments);
  this.gradients = [];
};

/**
 * Function: createStyle
 * 
 * Creates the optional style section.
 */
mxSvgCanvas2D.prototype.createStyle = function (x) {
  const style = this.createElement('style');
  style.setAttribute('type', 'text/css');
  mxUtils.write(style, `svg{font-family:${mxConstants.DEFAULT_FONTFAMILY 
  };font-size:${mxConstants.DEFAULT_FONTSIZE 
  };fill:none;stroke-miterlimit:10}`);
	
  return style;
};

/**
 * Function: createElement
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.createElement = function (tagName, namespace) {
  if (this.root.ownerDocument.createElementNS != null) {
    return this.root.ownerDocument.createElementNS(namespace || mxConstants.NS_SVG, tagName);
  }
	
  const elt = this.root.ownerDocument.createElement(tagName);
		
  if (namespace != null) {
    elt.setAttribute('xmlns', namespace);
  }
		
  return elt;
};

/**
 * Function: getAlternateContent
 * 
 * Returns the alternate content for the given foreignObject.
 */
mxSvgCanvas2D.prototype.createAlternateContent = function (fo, x, y, w, h, str, align, valign, wrap, format, overflow, clip, rotation) {
  if (this.foAltText != null) {
    const s = this.state;
    const alt = this.createElement('text');
    alt.setAttribute('x', Math.round(w / 2));
    alt.setAttribute('y', Math.round((h + s.fontSize) / 2));
    alt.setAttribute('fill', s.fontColor || 'black');
    alt.setAttribute('text-anchor', 'middle');
    alt.setAttribute('font-size', `${s.fontSize}px`);
    alt.setAttribute('font-family', s.fontFamily);
		
    if ((s.fontStyle & mxConstants.FONT_BOLD) == mxConstants.FONT_BOLD) {
      alt.setAttribute('font-weight', 'bold');
    }
		
    if ((s.fontStyle & mxConstants.FONT_ITALIC) == mxConstants.FONT_ITALIC) {
      alt.setAttribute('font-style', 'italic');
    }
		
    if ((s.fontStyle & mxConstants.FONT_UNDERLINE) == mxConstants.FONT_UNDERLINE) {
      alt.setAttribute('text-decoration', 'underline');
    }
		
    mxUtils.write(alt, this.foAltText);
		
    return alt;
  }
	
  return null;
};

/**
 * Function: createGradientId
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.createGradientId = function (start, end, alpha1, alpha2, direction) {
  // Removes illegal characters from gradient ID
  if (start.charAt(0) == '#') {
    start = start.substring(1);
  }
	
  if (end.charAt(0) == '#') {
    end = end.substring(1);
  }
	
  // Workaround for gradient IDs not working in Safari 5 / Chrome 6
  // if they contain uppercase characters
  start = `${start.toLowerCase()}-${alpha1}`;
  end = `${end.toLowerCase()}-${alpha2}`;

  // Wrong gradient directions possible?
  let dir = null;
	
  if (direction == null || direction == mxConstants.DIRECTION_SOUTH) {
    dir = 's';
  } else if (direction == mxConstants.DIRECTION_EAST) {
    dir = 'e';
  } else {
    const tmp = start;
    start = end;
    end = tmp;
		
    if (direction == mxConstants.DIRECTION_NORTH) {
      dir = 's';
    } else if (direction == mxConstants.DIRECTION_WEST) {
      dir = 'e';
    }
  }
	
  return `mx-gradient-${start}-${end}-${dir}`;
};

/**
 * Function: getSvgGradient
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.getSvgGradient = function (start, end, alpha1, alpha2, direction) {
  const id = this.createGradientId(start, end, alpha1, alpha2, direction);
  let gradient = this.gradients[id];
	
  if (gradient == null) {
    const svg = this.root.ownerSVGElement;

    let counter = 0;
    let tmpId = `${id}-${counter}`;

    if (svg != null) {
      gradient = svg.ownerDocument.getElementById(tmpId);
			
      while (gradient != null && gradient.ownerSVGElement != svg) {
        tmpId = `${id}-${counter++}`;
        gradient = svg.ownerDocument.getElementById(tmpId);
      }
    } else {
      // Uses shorter IDs for export
      tmpId = `id${++this.refCount}`;
    }

    if (gradient == null) {
      gradient = this.createSvgGradient(start, end, alpha1, alpha2, direction);
      gradient.setAttribute('id', tmpId);
			
      if (this.defs != null) {
        this.defs.appendChild(gradient);
      } else {
        svg.appendChild(gradient);
      }
    }

    this.gradients[id] = gradient;
  }

  return gradient.getAttribute('id');
};

/**
 * Function: createSvgGradient
 * 
 * Creates the given SVG gradient.
 */
mxSvgCanvas2D.prototype.createSvgGradient = function (start, end, alpha1, alpha2, direction) {
  const gradient = this.createElement('linearGradient');
  gradient.setAttribute('x1', '0%');
  gradient.setAttribute('y1', '0%');
  gradient.setAttribute('x2', '0%');
  gradient.setAttribute('y2', '0%');
	
  if (direction == null || direction == mxConstants.DIRECTION_SOUTH) {
    gradient.setAttribute('y2', '100%');
  } else if (direction == mxConstants.DIRECTION_EAST) {
    gradient.setAttribute('x2', '100%');
  } else if (direction == mxConstants.DIRECTION_NORTH) {
    gradient.setAttribute('y1', '100%');
  } else if (direction == mxConstants.DIRECTION_WEST) {
    gradient.setAttribute('x1', '100%');
  }
	
  let op = (alpha1 < 1) ? `;stop-opacity:${alpha1}` : '';
	
  let stop = this.createElement('stop');
  stop.setAttribute('offset', '0%');
  stop.setAttribute('style', `stop-color:${start}${op}`);
  gradient.appendChild(stop);
	
  op = (alpha2 < 1) ? `;stop-opacity:${alpha2}` : '';
	
  stop = this.createElement('stop');
  stop.setAttribute('offset', '100%');
  stop.setAttribute('style', `stop-color:${end}${op}`);
  gradient.appendChild(stop);
	
  return gradient;
};

/**
 * Function: addNode
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.addNode = function (filled, stroked) {
  const node = this.node;
  const s = this.state;

  if (node != null) {
    if (node.nodeName == 'path') {
      // Checks if the path is not empty
      if (this.path != null && this.path.length > 0) {
        node.setAttribute('d', this.path.join(' '));
      } else {
        return;
      }
    }

    if (filled && s.fillColor != null) {
      this.updateFill();
    } else if (!this.styleEnabled) {
      // Workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=814952
      if (node.nodeName == 'ellipse' && mxClient.IS_FF) {
        node.setAttribute('fill', 'transparent');
      } else {
        node.setAttribute('fill', 'none');
      }
			
      // Sets the actual filled state for stroke tolerance
      filled = false;
    }
		
    if (stroked && s.strokeColor != null) {
      this.updateStroke();
    } else if (!this.styleEnabled) {
      node.setAttribute('stroke', 'none');
    }
		
    if (s.transform != null && s.transform.length > 0) {
      node.setAttribute('transform', s.transform);
    }
		
    if (s.shadow) {
      this.root.appendChild(this.createShadow(node));
    }
	
    // Adds stroke tolerance
    if (this.strokeTolerance > 0 && !filled) {
      this.root.appendChild(this.createTolerance(node));
    }

    // Adds pointer events
    if (this.pointerEvents && (node.nodeName != 'path'
			|| this.path[this.path.length - 1] == this.closeOp)) {
      node.setAttribute('pointer-events', this.pointerEventsValue);
    }
    // Enables clicks for nodes inside a link element
    else if (!this.pointerEvents && this.originalRoot == null) {
      node.setAttribute('pointer-events', 'none');
    }
		
    // Removes invisible nodes from output if they don't handle events
    if ((node.nodeName != 'rect' && node.nodeName != 'path' && node.nodeName != 'ellipse')
			|| (node.getAttribute('fill') != 'none' && node.getAttribute('fill') != 'transparent')
			|| node.getAttribute('stroke') != 'none' || node.getAttribute('pointer-events') != 'none') {
      // LATER: Update existing DOM for performance		
      this.root.appendChild(node);
    }
		
    this.node = null;
  }
};

/**
 * Function: updateFill
 * 
 * Transfers the stroke attributes from <state> to <node>.
 */
mxSvgCanvas2D.prototype.updateFill = function () {
  const s = this.state;
	
  if (s.alpha < 1 || s.fillAlpha < 1) {
    this.node.setAttribute('fill-opacity', s.alpha * s.fillAlpha);
  }
	
  if (s.fillColor != null) {
    if (s.gradientColor != null) {
      const id = this.getSvgGradient(s.fillColor, s.gradientColor, s.gradientFillAlpha, s.gradientAlpha, s.gradientDirection);
			
      if (!mxClient.IS_CHROME_APP && !mxClient.IS_IE && !mxClient.IS_IE11
				&& !mxClient.IS_EDGE && this.root.ownerDocument == document) {
        // Workaround for potential base tag and brackets must be escaped
        const base = this.getBaseUrl().replace(/([\(\)])/g, '\\$1');
        this.node.setAttribute('fill', `url(${base}#${id})`);
      } else {
        this.node.setAttribute('fill', `url(#${id})`);
      }
    } else {
      this.node.setAttribute('fill', s.fillColor.toLowerCase());
    }
  }
};

/**
 * Function: getCurrentStrokeWidth
 * 
 * Returns the current stroke width (>= 1), ie. max(1, this.format(this.state.strokeWidth * this.state.scale)).
 */
mxSvgCanvas2D.prototype.getCurrentStrokeWidth = function () {
  // add by wantian
  return 1; // 默认所有 svg 的描边宽度都为1，且不随图形拉伸而缩放
  // return Math.max(this.minStrokeWidth, Math.max(0.01, this.format(this.state.strokeWidth * this.state.scale)));
};

/**
 * Function: updateStroke
 * 
 * Transfers the stroke attributes from <state> to <node>.
 */
mxSvgCanvas2D.prototype.updateStroke = function () {
  const s = this.state;

  this.node.setAttribute('stroke', s.strokeColor.toLowerCase());
	
  if (s.alpha < 1 || s.strokeAlpha < 1) {
    this.node.setAttribute('stroke-opacity', s.alpha * s.strokeAlpha);
  }
	
  const sw = this.getCurrentStrokeWidth();
	
  if (sw != 1) {
    this.node.setAttribute('stroke-width', sw);
  }

  if (this.node.nodeName == 'path') {
    this.updateStrokeAttributes();
  }
	
  if (s.dashed) {
    this.node.setAttribute('stroke-dasharray', this.createDashPattern(
      ((s.fixDash) ? 1 : s.strokeWidth) * s.scale
    ));
  }
};

/**
 * Function: updateStrokeAttributes
 * 
 * Transfers the stroke attributes from <state> to <node>.
 */
mxSvgCanvas2D.prototype.updateStrokeAttributes = function () {
  const s = this.state;
	
  // Linejoin miter is default in SVG
  if (s.lineJoin != null && s.lineJoin != 'miter') {
    this.node.setAttribute('stroke-linejoin', s.lineJoin);
  }
	
  if (s.lineCap != null) {
    // flat is called butt in SVG
    let value = s.lineCap;
		
    if (value == 'flat') {
      value = 'butt';
    }
		
    // Linecap butt is default in SVG
    if (value != 'butt') {
      this.node.setAttribute('stroke-linecap', value);
    }
  }
	
  // Miterlimit 10 is default in our document
  if (s.miterLimit != null && (!this.styleEnabled || s.miterLimit != 10)) {
    this.node.setAttribute('stroke-miterlimit', s.miterLimit);
  }
};

/**
 * Function: createDashPattern
 * 
 * Creates the SVG dash pattern for the given state.
 */
mxSvgCanvas2D.prototype.createDashPattern = function (scale) {
  const pat = [];
	
  if (typeof (this.state.dashPattern) === 'string') {
    const dash = this.state.dashPattern.split(' ');
		
    if (dash.length > 0) {
      for (let i = 0; i < dash.length; i++) {
        pat[i] = Number(dash[i]) * scale;
      }
    }
  }
	
  return pat.join(' ');
};

/**
 * Function: createTolerance
 * 
 * Creates a hit detection tolerance shape for the given node.
 */
mxSvgCanvas2D.prototype.createTolerance = function (node) {
  const tol = node.cloneNode(true);
  const sw = parseFloat(tol.getAttribute('stroke-width') || 1) + this.strokeTolerance;
  tol.setAttribute('pointer-events', 'stroke');
  tol.setAttribute('visibility', 'hidden');
  tol.removeAttribute('stroke-dasharray');
  tol.setAttribute('stroke-width', sw);
  tol.setAttribute('fill', 'none');
	
  // Workaround for Opera ignoring the visiblity attribute above while
  // other browsers need a stroke color to perform the hit-detection but
  // do not ignore the visibility attribute. Side-effect is that Opera's
  // hit detection for horizontal/vertical edges seems to ignore the tol.
  tol.setAttribute('stroke', (mxClient.IS_OT) ? 'none' : 'white');
	
  return tol;
};

/**
 * Function: createShadow
 * 
 * Creates a shadow for the given node.
 */
mxSvgCanvas2D.prototype.createShadow = function (node) {
  const shadow = node.cloneNode(true);
  const s = this.state;

  // Firefox uses transparent for no fill in ellipses
  if (shadow.getAttribute('fill') != 'none' && (!mxClient.IS_FF || shadow.getAttribute('fill') != 'transparent')) {
    shadow.setAttribute('fill', s.shadowColor);
  }
	
  if (shadow.getAttribute('stroke') != 'none') {
    shadow.setAttribute('stroke', s.shadowColor);
  }

  shadow.setAttribute('transform', `translate(${this.format(s.shadowDx * s.scale) 
  },${this.format(s.shadowDy * s.scale)})${s.transform || ''}`);
  shadow.setAttribute('opacity', s.shadowAlpha);
	
  return shadow;
};

/**
 * Function: setLink
 * 
 * Experimental implementation for hyperlinks.
 */
mxSvgCanvas2D.prototype.setLink = function (link) {
  if (link == null) {
    this.root = this.originalRoot;
  } else {
    this.originalRoot = this.root;
		
    const node = this.createElement('a');
		
    // Workaround for implicit namespace handling in HTML5 export, IE adds NS1 namespace so use code below
    // in all IE versions except quirks mode. KNOWN: Adds xlink namespace to each image tag in output.
    if (node.setAttributeNS == null || (this.root.ownerDocument != document && document.documentMode == null)) {
      node.setAttribute('xlink:href', link);
    } else {
      node.setAttributeNS(mxConstants.NS_XLINK, 'xlink:href', link);
    }
		
    this.root.appendChild(node);
    this.root = node;
  }
};

/**
 * Function: rotate
 * 
 * Sets the rotation of the canvas. Note that rotation cannot be concatenated.
 */
mxSvgCanvas2D.prototype.rotate = function (theta, flipH, flipV, cx, cy) {
  if (theta != 0 || flipH || flipV) {
    const s = this.state;
    cx += s.dx;
    cy += s.dy;
	
    cx *= s.scale;
    cy *= s.scale;

    s.transform = s.transform || '';
		
    // This implementation uses custom scale/translate and built-in rotation
    // Rotation state is part of the AffineTransform in state.transform
    if (flipH && flipV) {
      theta += 180;
    } else if (flipH != flipV) {
      const tx = (flipH) ? cx : 0;
      const sx = (flipH) ? -1 : 1;
	
      const ty = (flipV) ? cy : 0;
      const sy = (flipV) ? -1 : 1;

      s.transform += `translate(${this.format(tx)},${this.format(ty)})`
				+ `scale(${this.format(sx)},${this.format(sy)})`
				+ `translate(${this.format(-tx)},${this.format(-ty)})`;
    }
		
    if (flipH ? !flipV : flipV) {
      theta *= -1;
    }
		
    if (theta != 0) {
      s.transform += `rotate(${this.format(theta)},${this.format(cx)},${this.format(cy)})`;
    }
		
    s.rotation += theta;
    s.rotationCx = cx;
    s.rotationCy = cy;
  }
};

/**
 * Function: begin
 * 
 * Extends superclass to create path.
 */
mxSvgCanvas2D.prototype.begin = function () {
  mxAbstractCanvas2D.prototype.begin.apply(this, arguments);
  this.node = this.createElement('path');
};

/**
 * Function: rect
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.rect = function (x, y, w, h) {
  const s = this.state;
  const n = this.createElement('rect');
  n.setAttribute('x', this.format((x + s.dx) * s.scale));
  n.setAttribute('y', this.format((y + s.dy) * s.scale));
  n.setAttribute('width', this.format(w * s.scale));
  n.setAttribute('height', this.format(h * s.scale));
	
  this.node = n;
};

/**
 * Function: roundrect
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.roundrect = function (x, y, w, h, dx, dy) {
  this.rect(x, y, w, h);
	
  if (dx > 0) {
    this.node.setAttribute('rx', this.format(dx * this.state.scale));
  }
	
  if (dy > 0) {
    this.node.setAttribute('ry', this.format(dy * this.state.scale));
  }
};

/**
 * Function: ellipse
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.ellipse = function (x, y, w, h) {
  const s = this.state;
  const n = this.createElement('ellipse');
  // No rounding for consistent output with 1.x
  n.setAttribute('cx', Math.round((x + w / 2 + s.dx) * s.scale));
  n.setAttribute('cy', Math.round((y + h / 2 + s.dy) * s.scale));
  n.setAttribute('rx', w / 2 * s.scale);
  n.setAttribute('ry', h / 2 * s.scale);
  this.node = n;
};

/**
 * Function: image
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.image = function (x, y, w, h, src, aspect, flipH, flipV) {
  src = this.converter.convert(src);
	
  // LATER: Add option for embedding images as base64.
  aspect = (aspect != null) ? aspect : true;
  flipH = (flipH != null) ? flipH : false;
  flipV = (flipV != null) ? flipV : false;
	
  const s = this.state;
  x += s.dx;
  y += s.dy;

  let node = this.createElement('image');
  node.setAttribute('x', this.format(x * s.scale) + this.imageOffset);
  node.setAttribute('y', this.format(y * s.scale) + this.imageOffset);
  node.setAttribute('width', this.format(w * s.scale));
  node.setAttribute('height', this.format(h * s.scale));
	
  // Workaround for missing namespace support
  if (node.setAttributeNS == null) {
    node.setAttribute('xlink:href', src);
  } else {
    node.setAttributeNS(mxConstants.NS_XLINK, 'xlink:href', src);
  }
	
  if (!aspect) {
    node.setAttribute('preserveAspectRatio', 'none');
  }

  if (s.alpha < 1 || s.fillAlpha < 1) {
    node.setAttribute('opacity', s.alpha * s.fillAlpha);
  }
	
  let tr = this.state.transform || '';
	
  if (flipH || flipV) {
    let sx = 1;
    let sy = 1;
    let dx = 0;
    let dy = 0;
		
    if (flipH) {
      sx = -1;
      dx = -w - 2 * x;
    }
		
    if (flipV) {
      sy = -1;
      dy = -h - 2 * y;
    }
		
    // Adds image tansformation to existing transform
    tr += `scale(${sx},${sy})translate(${dx * s.scale},${dy * s.scale})`;
  }

  if (tr.length > 0) {
    node.setAttribute('transform', tr);
  }
	
  if (!this.pointerEvents) {
    node.setAttribute('pointer-events', 'none');
  }
  
  this.root.appendChild(node);
	
  // Disables control-clicks on images in Firefox to open in new tab
  // by putting a rect in the foreground that absorbs all events and
  // disabling all pointer-events on the original image tag.
  if (this.blockImagePointerEvents) {
    node.setAttribute('style', 'pointer-events:none');
		
    node = this.createElement('rect');
    node.setAttribute('visibility', 'hidden');
    node.setAttribute('pointer-events', 'fill');
    node.setAttribute('x', this.format(x * s.scale));
    node.setAttribute('y', this.format(y * s.scale));
    node.setAttribute('width', this.format(w * s.scale));
    node.setAttribute('height', this.format(h * s.scale));
    this.root.appendChild(node);
  }
};

/**
 * Function: convertHtml
 * 
 * Converts the given HTML string to XHTML.
 */
mxSvgCanvas2D.prototype.convertHtml = function (val) {
  if (this.useDomParser) {
    const doc = new DOMParser().parseFromString(val, 'text/html');

    if (doc != null) {
      val = new XMLSerializer().serializeToString(doc.body);
			
      // Extracts body content from DOM
      if (val.substring(0, 5) == '<body') {
        val = val.substring(val.indexOf('>', 5) + 1);
      }
			
      if (val.substring(val.length - 7, val.length) == '</body>') {
        val = val.substring(0, val.length - 7);
      }
    }
  } else if (document.implementation != null && document.implementation.createDocument != null) {
    const xd = document.implementation.createDocument('http://www.w3.org/1999/xhtml', 'html', null);
    const xb = xd.createElement('body');
    xd.documentElement.appendChild(xb);
		
    const div = document.createElement('div');
    div.innerHTML = val;
    let child = div.firstChild;
		
    while (child != null) {
      const next = child.nextSibling;
      xb.appendChild(xd.adoptNode(child));
      child = next;
    }
		
    return xb.innerHTML;
  } else {
    const ta = document.createElement('textarea');
		
    // Handles special HTML entities < and > and double escaping
    // and converts unclosed br, hr and img tags to XHTML
    // LATER: Convert all unclosed tags
    ta.innerHTML = val.replace(/&amp;/g, '&amp;amp;')
      .replace(/&#60;/g, '&amp;lt;').replace(/&#62;/g, '&amp;gt;')
      .replace(/&lt;/g, '&amp;lt;')
      .replace(/&gt;/g, '&amp;gt;')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;');
    val = ta.value.replace(/&/g, '&amp;').replace(/&amp;lt;/g, '&lt;')
      .replace(/&amp;gt;/g, '&gt;').replace(/&amp;amp;/g, '&amp;')
      .replace(/<br>/g, '<br />')
      .replace(/<hr>/g, '<hr />')
      .replace(/(<img[^>]+)>/gm, '$1 />');
  }
	
  return val;
};

/**
 * Function: createDiv
 * 
 * Private helper function to create SVG elements
 */
mxSvgCanvas2D.prototype.createDiv = function (str, align, valign, style, overflow) {
  const s = this.state;

  // Inline block for rendering HTML background over SVG in Safari
  const lh = (mxConstants.ABSOLUTE_LINE_HEIGHT) ? `${s.fontSize * mxConstants.LINE_HEIGHT}px`
    : (mxConstants.LINE_HEIGHT * this.lineHeightCorrection);
	
  style = `display:inline-block;font-size:${s.fontSize}px;font-family:${s.fontFamily 
  };color:${s.fontColor};line-height:${lh};${style}`;

  if ((s.fontStyle & mxConstants.FONT_BOLD) == mxConstants.FONT_BOLD) {
    style += 'font-weight:bold;';
  }

  if ((s.fontStyle & mxConstants.FONT_ITALIC) == mxConstants.FONT_ITALIC) {
    style += 'font-style:italic;';
  }
	
  if ((s.fontStyle & mxConstants.FONT_UNDERLINE) == mxConstants.FONT_UNDERLINE) {
    style += 'text-decoration:underline;';
  }
	
  if (align == mxConstants.ALIGN_CENTER) {
    style += 'text-align:center;';
  } else if (align == mxConstants.ALIGN_RIGHT) {
    style += 'text-align:right;';
  }

  let css = '';
	
  if (s.fontBackgroundColor != null) {
    css += `background-color:${s.fontBackgroundColor};`;
  }
	
  if (s.fontBorderColor != null) {
    css += `border:1px solid ${s.fontBorderColor};`;
  }
	
  let val = str;
	
  if (!mxUtils.isNode(val)) {
    val = this.convertHtml(val);
		
    if (overflow != 'fill' && overflow != 'width') {
      // Inner div always needed to measure wrapped text
      val = `<div xmlns="http://www.w3.org/1999/xhtml" style="display:inline-block;text-align:inherit;text-decoration:inherit;${css}">${val}</div>`;
    } else {
      style += css;
    }
  }

  // Uses DOM API where available. This cannot be used in IE to avoid
  // an opening and two (!) closing TBODY tags being added to tables.
  if (!mxClient.IS_IE && document.createElementNS) {
    const div = document.createElementNS('http://www.w3.org/1999/xhtml', 'div');
    div.setAttribute('style', style);
		
    if (mxUtils.isNode(val)) {
      // Creates a copy for export
      if (this.root.ownerDocument != document) {
        div.appendChild(val.cloneNode(true));
      } else {
        div.appendChild(val);
      }
    } else {
      div.innerHTML = val;
    }
		
    return div;
  }
	
  // Serializes for export
  if (mxUtils.isNode(val) && this.root.ownerDocument != document) {
    val = val.outerHTML;
  }

  // NOTE: FF 3.6 crashes if content CSS contains "height:100%"
  return mxUtils.parseXml(`<div xmlns="http://www.w3.org/1999/xhtml" style="${style  
  }">${val}</div>`).documentElement;
};

/**
 * Invalidates the cached offset size for the given node.
 */
mxSvgCanvas2D.prototype.invalidateCachedOffsetSize = function (node) {
  delete node.firstChild.mxCachedOffsetWidth;
  delete node.firstChild.mxCachedFinalOffsetWidth;
  delete node.firstChild.mxCachedFinalOffsetHeight;
};

/**
 * Updates existing DOM nodes for text rendering. LATER: Merge common parts with text function below.
 */
mxSvgCanvas2D.prototype.updateText = function (x, y, w, h, align, valign, wrap, overflow, clip, rotation, node) {
  if (node != null && node.firstChild != null && node.firstChild.firstChild != null
		&& node.firstChild.firstChild.firstChild != null) {
    // Uses outer group for opacity and transforms to
    // fix rendering order in Chrome
    const group = node.firstChild;
    const fo = group.firstChild;
    const div = fo.firstChild;

    rotation = (rotation != null) ? rotation : 0;
		
    const s = this.state;
    x += s.dx;
    y += s.dy;
		
    if (clip) {
      div.style.maxHeight = `${Math.round(h)}px`;
      div.style.maxWidth = `${Math.round(w)}px`;
    } else if (overflow == 'fill') {
      div.style.width = `${Math.round(w + 1)}px`;
      div.style.height = `${Math.round(h + 1)}px`;
    } else if (overflow == 'width') {
      div.style.width = `${Math.round(w + 1)}px`;
			
      if (h > 0) {
        div.style.maxHeight = `${Math.round(h)}px`;
      }
    }

    if (wrap && w > 0) {
      div.style.width = `${Math.round(w + 1)}px`;
    }
		
    // Code that depends on the size which is computed after
    // the element was added to the DOM.
    let ow = 0;
    let oh = 0;
		
    // Padding avoids clipping on border and wrapping for differing font metrics on platforms
    const padX = 0;
    const padY = 2;

    let sizeDiv = div;
		
    if (sizeDiv.firstChild != null && sizeDiv.firstChild.nodeName == 'DIV') {
      sizeDiv = sizeDiv.firstChild;
    }
		
    const tmp = (group.mxCachedOffsetWidth != null) ? group.mxCachedOffsetWidth : sizeDiv.offsetWidth;
    ow = tmp + padX;

    // Recomputes the height of the element for wrapped width
    if (wrap && overflow != 'fill') {
      if (clip) {
        ow = Math.min(ow, w);
      }
			
      div.style.width = `${Math.round(ow + 1)}px`;
    }

    ow = (group.mxCachedFinalOffsetWidth != null) ? group.mxCachedFinalOffsetWidth : sizeDiv.offsetWidth;
    oh = (group.mxCachedFinalOffsetHeight != null) ? group.mxCachedFinalOffsetHeight : sizeDiv.offsetHeight;
		
    if (this.cacheOffsetSize) {
      group.mxCachedOffsetWidth = tmp;
      group.mxCachedFinalOffsetWidth = ow;
      group.mxCachedFinalOffsetHeight = oh;
    }
		
    ow += padX;
    oh -= 2;
		
    if (clip) {
      oh = Math.min(oh, h);
      ow = Math.min(ow, w);
    }

    if (overflow == 'width') {
      h = oh;
    } else if (overflow != 'fill') {
      w = ow;
      h = oh;
    }

    let dx = 0;
    let dy = 0;

    if (align == mxConstants.ALIGN_CENTER) {
      dx -= w / 2;
    } else if (align == mxConstants.ALIGN_RIGHT) {
      dx -= w;
    }
		
    x += dx;
		
    // FIXME: LINE_HEIGHT not ideal for all text sizes, fix for export
    if (valign == mxConstants.ALIGN_MIDDLE) {
      dy -= h / 2;
    } else if (valign == mxConstants.ALIGN_BOTTOM) {
      dy -= h;
    }
		
    // Workaround for rendering offsets
    // TODO: Check if export needs these fixes, too
    if (overflow != 'fill' && mxClient.IS_FF && mxClient.IS_WIN) {
      dy -= 2;
    }
		
    y += dy;

    let tr = (s.scale != 1) ? `scale(${s.scale})` : '';

    if (s.rotation != 0 && this.rotateHtml) {
      tr += `rotate(${s.rotation},${w / 2},${h / 2})`;
      const pt = this.rotatePoint((x + w / 2) * s.scale, (y + h / 2) * s.scale,
        s.rotation, s.rotationCx, s.rotationCy);
      x = pt.x - w * s.scale / 2;
      y = pt.y - h * s.scale / 2;
    } else {
      x *= s.scale;
      y *= s.scale;
    }

    if (rotation != 0) {
      tr += `rotate(${rotation},${-dx},${-dy})`;
    }

    group.setAttribute('transform', `translate(${Math.round(x)},${Math.round(y)})${tr}`);
    fo.setAttribute('width', Math.round(Math.max(1, w)));
    fo.setAttribute('height', Math.round(Math.max(1, h)));
  }
};

/**
 * Function: text
 * 
 * Paints the given text. Possible values for format are empty string for plain
 * text and html for HTML markup. Note that HTML markup is only supported if
 * foreignObject is supported and <foEnabled> is true. (This means IE9 and later
 * does currently not support HTML text as part of shapes.)
 */
mxSvgCanvas2D.prototype.text = function (x, y, w, h, str, align, valign, wrap, format, overflow, clip, rotation, dir) {
  if (this.textEnabled && str != null) {
    rotation = (rotation != null) ? rotation : 0;
		
    const s = this.state;
    x += s.dx;
    y += s.dy;
		
    if (this.foEnabled && format == 'html') {
      let style = 'vertical-align:top;';
			
      if (clip) {
        style += `overflow:hidden;max-height:${Math.round(h)}px;max-width:${Math.round(w)}px;`;
      } else if (overflow == 'fill') {
        style += `width:${Math.round(w + 1)}px;height:${Math.round(h + 1)}px;overflow:hidden;`;
      } else if (overflow == 'width') {
        style += `width:${Math.round(w + 1)}px;`;
				
        if (h > 0) {
          style += `max-height:${Math.round(h)}px;overflow:hidden;`;
        }
      }

      if (wrap && w > 0) {
        style += `width:${Math.round(w + 1)}px;white-space:normal;word-wrap:${ 
          mxConstants.WORD_WRAP};`;
      } else {
        style += 'white-space:nowrap;';
      }
			
      // Uses outer group for opacity and transforms to
      // fix rendering order in Chrome
      const group = this.createElement('g');
			
      if (s.alpha < 1) {
        group.setAttribute('opacity', s.alpha);
      }

      const fo = this.createElement('foreignObject');
      fo.setAttribute('style', 'overflow:visible;');
      fo.setAttribute('pointer-events', 'all');
			
      const div = this.createDiv(str, align, valign, style, overflow);
			
      // Ignores invalid XHTML labels
      if (div == null) {
        return;
      }
      if (dir != null) {
        div.setAttribute('dir', dir);
      }

      group.appendChild(fo);
      this.root.appendChild(group);
			
      // Code that depends on the size which is computed after
      // the element was added to the DOM.
      let ow = 0;
      let oh = 0;
			
      // Padding avoids clipping on border and wrapping for differing font metrics on platforms
      let padX = 2;
      let padY = 2;

      // NOTE: IE is always export as it does not support foreign objects
      if (mxClient.IS_IE && (document.documentMode == 9 || !mxClient.IS_SVG)) {
        // Handles non-standard namespace for getting size in IE
        const clone = document.createElement('div');
				
        clone.style.cssText = div.getAttribute('style');
        clone.style.display = (mxClient.IS_QUIRKS) ? 'inline' : 'inline-block';
        clone.style.position = 'absolute';
        clone.style.visibility = 'hidden';

        // Inner DIV is needed for text measuring
        const div2 = document.createElement('div');
        div2.style.display = (mxClient.IS_QUIRKS) ? 'inline' : 'inline-block';
        div2.style.wordWrap = mxConstants.WORD_WRAP;
        div2.innerHTML = (mxUtils.isNode(str)) ? str.outerHTML : str;
        clone.appendChild(div2);

        document.body.appendChild(clone);

        // Workaround for different box models
        if (document.documentMode != 8 && document.documentMode != 9 && s.fontBorderColor != null) {
          padX += 2;
          padY += 2;
        }

        if (wrap && w > 0) {
          var tmp = div2.offsetWidth;
					
          // Workaround for adding padding twice in IE8/IE9 standards mode if label is wrapped
          padDx = 0;
					
          // For export, if no wrapping occurs, we add a large padding to make
          // sure there is no wrapping even if the text metrics are different.
          // This adds support for text metrics on different operating systems.
          // Disables wrapping if text is not wrapped for given width
          if (!clip && wrap && w > 0 && this.root.ownerDocument != document && overflow != 'fill') {
            var ws = clone.style.whiteSpace;
            div2.style.whiteSpace = 'nowrap';
						
            if (tmp < div2.offsetWidth) {
              clone.style.whiteSpace = ws;
            }
          }
					
          if (clip) {
            tmp = Math.min(tmp, w);
          }
					
          clone.style.width = `${tmp}px`;
	
          // Padding avoids clipping on border
          ow = div2.offsetWidth + padX + padDx;
          oh = div2.offsetHeight + padY;
					
          // Overrides the width of the DIV via XML DOM by using the
          // clone DOM style, getting the CSS text for that and
          // then setting that on the DIV via setAttribute
          clone.style.display = 'inline-block';
          clone.style.position = '';
          clone.style.visibility = '';
          clone.style.width = `${ow}px`;
					
          div.setAttribute('style', clone.style.cssText);
        } else {
          // Padding avoids clipping on border
          ow = div2.offsetWidth + padX;
          oh = div2.offsetHeight + padY;
        }

        clone.parentNode.removeChild(clone);
        fo.appendChild(div);
      } else {
        // Uses document for text measuring during export
        if (this.root.ownerDocument != document) {
          div.style.visibility = 'hidden';
          document.body.appendChild(div);
        } else {
          fo.appendChild(div);
        }

        let sizeDiv = div;
				
        if (sizeDiv.firstChild != null && sizeDiv.firstChild.nodeName == 'DIV') {
          sizeDiv = sizeDiv.firstChild;
					
          if (wrap && div.style.wordWrap == 'break-word') {
            sizeDiv.style.width = '100%';
          }
        }
				
        var tmp = sizeDiv.offsetWidth;
				
        // Workaround for text measuring in hidden containers
        if (tmp == 0 && div.parentNode == fo) {
          div.style.visibility = 'hidden';
          document.body.appendChild(div);
					
          tmp = sizeDiv.offsetWidth;
        }
				
        if (this.cacheOffsetSize) {
          group.mxCachedOffsetWidth = tmp;
        }
				
        // Disables wrapping if text is not wrapped for given width
        if (!clip && wrap && w > 0 && this.root.ownerDocument != document
					&& overflow != 'fill' && overflow != 'width') {
          var ws = div.style.whiteSpace;
          div.style.whiteSpace = 'nowrap';
					
          if (tmp < sizeDiv.offsetWidth) {
            div.style.whiteSpace = ws;
          }
        }

        ow = tmp + padX - 1;

        // Recomputes the height of the element for wrapped width
        if (wrap && overflow != 'fill' && overflow != 'width') {
          if (clip) {
            ow = Math.min(ow, w);
          }
					
          div.style.width = `${ow}px`;
        }

        ow = sizeDiv.offsetWidth;
        oh = sizeDiv.offsetHeight;
				
        if (this.cacheOffsetSize) {
          group.mxCachedFinalOffsetWidth = ow;
          group.mxCachedFinalOffsetHeight = oh;
        }

        oh -= padY;
				
        if (div.parentNode != fo) {
          fo.appendChild(div);
          div.style.visibility = '';
        }
      }

      if (clip) {
        oh = Math.min(oh, h);
        ow = Math.min(ow, w);
      }

      if (overflow == 'width') {
        h = oh;
      } else if (overflow != 'fill') {
        w = ow;
        h = oh;
      }

      if (s.alpha < 1) {
        group.setAttribute('opacity', s.alpha);
      }
			
      let dx = 0;
      let dy = 0;

      if (align == mxConstants.ALIGN_CENTER) {
        dx -= w / 2;
      } else if (align == mxConstants.ALIGN_RIGHT) {
        dx -= w;
      }
			
      x += dx;
			
      // FIXME: LINE_HEIGHT not ideal for all text sizes, fix for export
      if (valign == mxConstants.ALIGN_MIDDLE) {
        dy -= h / 2;
      } else if (valign == mxConstants.ALIGN_BOTTOM) {
        dy -= h;
      }
			
      // Workaround for rendering offsets
      // TODO: Check if export needs these fixes, too
      // if (this.root.ownerDocument == document)
      if (overflow != 'fill' && mxClient.IS_FF && mxClient.IS_WIN) {
        dy -= 2;
      }
			
      y += dy;

      let tr = (s.scale != 1) ? `scale(${s.scale})` : '';

      if (s.rotation != 0 && this.rotateHtml) {
        tr += `rotate(${s.rotation},${w / 2},${h / 2})`;
        const pt = this.rotatePoint((x + w / 2) * s.scale, (y + h / 2) * s.scale,
          s.rotation, s.rotationCx, s.rotationCy);
        x = pt.x - w * s.scale / 2;
        y = pt.y - h * s.scale / 2;
      } else {
        x *= s.scale;
        y *= s.scale;
      }

      if (rotation != 0) {
        tr += `rotate(${rotation},${-dx},${-dy})`;
      }

      group.setAttribute('transform', `translate(${Math.round(x) + this.foOffset},${ 
        Math.round(y) + this.foOffset})${tr}`);
      fo.setAttribute('width', Math.round(Math.max(1, w)));
      fo.setAttribute('height', Math.round(Math.max(1, h)));
			
      // Adds alternate content if foreignObject not supported in viewer
      if (this.root.ownerDocument != document) {
        const alt = this.createAlternateContent(fo, x, y, w, h, str, align, valign, wrap, format, overflow, clip, rotation);
				
        if (alt != null) {
          fo.setAttribute('requiredFeatures', 'http://www.w3.org/TR/SVG11/feature#Extensibility');
          const sw = this.createElement('switch');
          sw.appendChild(fo);
          sw.appendChild(alt);
          group.appendChild(sw);
        }
      }
    } else {
      this.plainText(x, y, w, h, str, align, valign, wrap, overflow, clip, rotation, dir);
    }
  }
};

/**
 * Function: createClip
 * 
 * Creates a clip for the given coordinates.
 */
mxSvgCanvas2D.prototype.createClip = function (x, y, w, h) {
  x = Math.round(x);
  y = Math.round(y);
  w = Math.round(w);
  h = Math.round(h);
	
  const id = `mx-clip-${x}-${y}-${w}-${h}`;

  let counter = 0;
  let tmp = `${id}-${counter}`;
	
  // Resolves ID conflicts
  while (document.getElementById(tmp) != null) {
    tmp = `${id}-${++counter}`;
  }
	
  clip = this.createElement('clipPath');
  clip.setAttribute('id', tmp);
	
  const rect = this.createElement('rect');
  rect.setAttribute('x', x);
  rect.setAttribute('y', y);
  rect.setAttribute('width', w);
  rect.setAttribute('height', h);
		
  clip.appendChild(rect);
	
  return clip;
};

/**
 * Function: text
 * 
 * Paints the given text. Possible values for format are empty string for
 * plain text and html for HTML markup.
 */
mxSvgCanvas2D.prototype.plainText = function (x, y, w, h, str, align, valign, wrap, overflow, clip, rotation, dir) {
  rotation = (rotation != null) ? rotation : 0;
  const s = this.state;
  const size = s.fontSize;
  const node = this.createElement('g');
  let tr = s.transform || '';
  this.updateFont(node);
	
  // Non-rotated text
  if (rotation != 0) {
    tr += `rotate(${rotation},${this.format(x * s.scale)},${this.format(y * s.scale)})`;
  }
	
  if (dir != null) {
    node.setAttribute('direction', dir);
  }

  if (clip && w > 0 && h > 0) {
    let cx = x;
    var cy = y;
		
    if (align == mxConstants.ALIGN_CENTER) {
      cx -= w / 2;
    } else if (align == mxConstants.ALIGN_RIGHT) {
      cx -= w;
    }
		
    if (overflow != 'fill') {
      if (valign == mxConstants.ALIGN_MIDDLE) {
        cy -= h / 2;
      } else if (valign == mxConstants.ALIGN_BOTTOM) {
        cy -= h;
      }
    }
		
    // LATER: Remove spacing from clip rectangle
    const c = this.createClip(cx * s.scale - 2, cy * s.scale - 2, w * s.scale + 4, h * s.scale + 4);
		
    if (this.defs != null) {
      this.defs.appendChild(c);
    } else {
      // Makes sure clip is removed with referencing node
      this.root.appendChild(c);
    }
		
    if (!mxClient.IS_CHROME_APP && !mxClient.IS_IE && !mxClient.IS_IE11
			&& !mxClient.IS_EDGE && this.root.ownerDocument == document) {
      // Workaround for potential base tag
      const base = this.getBaseUrl().replace(/([\(\)])/g, '\\$1');
      node.setAttribute('clip-path', `url(${base}#${c.getAttribute('id')})`);
    } else {
      node.setAttribute('clip-path', `url(#${c.getAttribute('id')})`);
    }
  }

  // Default is left
  const anchor = (align == mxConstants.ALIGN_RIGHT) ? 'end'
    : (align == mxConstants.ALIGN_CENTER) ? 'middle'
      : 'start';

  // Text-anchor start is default in SVG
  if (anchor != 'start') {
    node.setAttribute('text-anchor', anchor);
  }
	
  if (!this.styleEnabled || size != mxConstants.DEFAULT_FONTSIZE) {
    node.setAttribute('font-size', `${size * s.scale}px`);
  }
	
  if (tr.length > 0) {
    node.setAttribute('transform', tr);
  }
	
  if (s.alpha < 1) {
    node.setAttribute('opacity', s.alpha);
  }
	
  const lines = str.split('\n');
  const lh = Math.round(size * mxConstants.LINE_HEIGHT);
  const textHeight = size + (lines.length - 1) * lh;

  var cy = y + size - 1;

  if (valign == mxConstants.ALIGN_MIDDLE) {
    if (overflow == 'fill') {
      cy -= h / 2;
    } else {
      var dy = ((this.matchHtmlAlignment && clip && h > 0) ? Math.min(textHeight, h) : textHeight) / 2;
      cy -= dy + 1;
    }
  } else if (valign == mxConstants.ALIGN_BOTTOM) {
    if (overflow == 'fill') {
      cy -= h;
    } else {
      var dy = (this.matchHtmlAlignment && clip && h > 0) ? Math.min(textHeight, h) : textHeight;
      cy -= dy + 2;
    }
  }

  for (let i = 0; i < lines.length; i++) {
    // Workaround for bounding box of empty lines and spaces
    if (lines[i].length > 0 && mxUtils.trim(lines[i]).length > 0) {
      const text = this.createElement('text');
      // LATER: Match horizontal HTML alignment
      text.setAttribute('x', this.format(x * s.scale) + this.textOffset);
      text.setAttribute('y', this.format(cy * s.scale) + this.textOffset);
			
      mxUtils.write(text, lines[i]);
      node.appendChild(text);
    }

    cy += lh;
  }

  this.root.appendChild(node);
  this.addTextBackground(node, str, x, y, w, (overflow == 'fill') ? h : textHeight, align, valign, overflow);
};

/**
 * Function: updateFont
 * 
 * Updates the text properties for the given node. (NOTE: For this to work in
 * IE, the given node must be a text or tspan element.)
 */
mxSvgCanvas2D.prototype.updateFont = function (node) {
  const s = this.state;

  node.setAttribute('fill', s.fontColor);
	
  if (!this.styleEnabled || s.fontFamily != mxConstants.DEFAULT_FONTFAMILY) {
    node.setAttribute('font-family', s.fontFamily);
  }

  if ((s.fontStyle & mxConstants.FONT_BOLD) == mxConstants.FONT_BOLD) {
    node.setAttribute('font-weight', 'bold');
  }

  if ((s.fontStyle & mxConstants.FONT_ITALIC) == mxConstants.FONT_ITALIC) {
    node.setAttribute('font-style', 'italic');
  }
	
  if ((s.fontStyle & mxConstants.FONT_UNDERLINE) == mxConstants.FONT_UNDERLINE) {
    node.setAttribute('text-decoration', 'underline');
  }
};

/**
 * Function: addTextBackground
 * 
 * Background color and border
 */
mxSvgCanvas2D.prototype.addTextBackground = function (node, str, x, y, w, h, align, valign, overflow) {
  const s = this.state;

  if (s.fontBackgroundColor != null || s.fontBorderColor != null) {
    let bbox = null;
		
    if (overflow == 'fill' || overflow == 'width') {
      if (align == mxConstants.ALIGN_CENTER) {
        x -= w / 2;
      } else if (align == mxConstants.ALIGN_RIGHT) {
        x -= w;
      }
			
      if (valign == mxConstants.ALIGN_MIDDLE) {
        y -= h / 2;
      } else if (valign == mxConstants.ALIGN_BOTTOM) {
        y -= h;
      }
			
      bbox = new mxRectangle((x + 1) * s.scale, y * s.scale, (w - 2) * s.scale, (h + 2) * s.scale);
    } else if (node.getBBox != null && this.root.ownerDocument == document) {
      // Uses getBBox only if inside document for correct size
      try {
        bbox = node.getBBox();
        const ie = mxClient.IS_IE && mxClient.IS_SVG;
        bbox = new mxRectangle(bbox.x, bbox.y + ((ie) ? 0 : 1), bbox.width, bbox.height + ((ie) ? 1 : 0));
      } catch (e) {
        // Ignores NS_ERROR_FAILURE in FF if container display is none.
      }
    } else {
      // Computes size if not in document or no getBBox available
      const div = document.createElement('div');

      // Wrapping and clipping can be ignored here
      div.style.lineHeight = (mxConstants.ABSOLUTE_LINE_HEIGHT) ? `${s.fontSize * mxConstants.LINE_HEIGHT}px` : mxConstants.LINE_HEIGHT;
      div.style.fontSize = `${s.fontSize}px`;
      div.style.fontFamily = s.fontFamily;
      div.style.whiteSpace = 'nowrap';
      div.style.position = 'absolute';
      div.style.visibility = 'hidden';
      div.style.display = (mxClient.IS_QUIRKS) ? 'inline' : 'inline-block';
      div.style.zoom = '1';
			
      if ((s.fontStyle & mxConstants.FONT_BOLD) == mxConstants.FONT_BOLD) {
        div.style.fontWeight = 'bold';
      }

      if ((s.fontStyle & mxConstants.FONT_ITALIC) == mxConstants.FONT_ITALIC) {
        div.style.fontStyle = 'italic';
      }
			
      str = mxUtils.htmlEntities(str, false);
      div.innerHTML = str.replace(/\n/g, '<br/>');
			
      document.body.appendChild(div);
      var w = div.offsetWidth;
      var h = div.offsetHeight;
      div.parentNode.removeChild(div);
			
      if (align == mxConstants.ALIGN_CENTER) {
        x -= w / 2;
      } else if (align == mxConstants.ALIGN_RIGHT) {
        x -= w;
      }
			
      if (valign == mxConstants.ALIGN_MIDDLE) {
        y -= h / 2;
      } else if (valign == mxConstants.ALIGN_BOTTOM) {
        y -= h;
      }
			
      bbox = new mxRectangle((x + 1) * s.scale, (y + 2) * s.scale, w * s.scale, (h + 1) * s.scale);
    }
		
    if (bbox != null) {
      const n = this.createElement('rect');
      n.setAttribute('fill', s.fontBackgroundColor || 'none');
      n.setAttribute('stroke', s.fontBorderColor || 'none');
      n.setAttribute('x', Math.floor(bbox.x - 1));
      n.setAttribute('y', Math.floor(bbox.y - 1));
      n.setAttribute('width', Math.ceil(bbox.width + 2));
      n.setAttribute('height', Math.ceil(bbox.height));

      const sw = (s.fontBorderColor != null) ? Math.max(1, this.format(s.scale)) : 0;
      n.setAttribute('stroke-width', sw);
			
      // Workaround for crisp rendering - only required if not exporting
      if (this.root.ownerDocument == document && mxUtils.mod(sw, 2) == 1) {
        n.setAttribute('transform', 'translate(0.5, 0.5)');
      }
			
      node.insertBefore(n, node.firstChild);
    }
  }
};

/**
 * Function: stroke
 * 
 * Paints the outline of the current path.
 */
mxSvgCanvas2D.prototype.stroke = function () {
  this.addNode(false, true);
};

/**
 * Function: fill
 * 
 * Fills the current path.
 */
mxSvgCanvas2D.prototype.fill = function () {
  this.addNode(true, false);
};

/**
 * Function: fillAndStroke
 * 
 * Fills and paints the outline of the current path.
 */
mxSvgCanvas2D.prototype.fillAndStroke = function () {
  this.addNode(true, true);
};

window.mxSvgCanvas2D = mxSvgCanvas2D;
